Let's put this into perspective: Gator Steve Ross School of Business at the University of Michigan is the lease holder. His CEO of the The Related Group Florida is Jorge M. Pérez, who is on UM's BOT, (another Michigan Alum, go figure) and UM's Business School Dean came from the University of Michigan. See the pattern? The only scenario which could benefit UM is the fútbol stadium is built...And no one attends. That is a distinct possibility given the Minor League nature of "Major" League Soccer. This isn't the NASL of the 70s/early-80s, paying big money for top talent. If Miami's team was going into the Primera División via special dispensation from La Liga, yep, they would need 40,000+ easy. This isn't Columbus or Salt Lake or even Seattle (you wonder why UDub fell off of the CFB map? Check out soccer Mom and Dad at a Sounders game), it's MIAMI. People here can follow all the foreign leagues (many in their mother tongue) and know where the best fútbol is being played...And it is not in the MLS.
Sooooo...the Miami MLS team, Un-clutch Penalty Shot Beckham or not, FAILS. The City of Miami/Miami-Dade County, circa 2020, is post Regalado/Giménez and is desperate to have a tenant for the 25,000 seat eyesore which they inherited when Beckham's team went belly-up. They beg The Related Group to come in and re-develop the area, modernise/replace AAA (a bit long in the tooth by then) and expand the stadium to bring in said tenant (READ: UM). Ross, if still alive, would be 80, and he and Perez (by then 70) would make their last big deal where Perez started it all, in Miami.
And that friends is how you MAY get a new stadium, in the world of crony capitilism and "private-public partnerships"